Task decision difficulty: effects on ERPs in a same-different letter classification task

Palmer, Barbara; Nasman, Victoria Tepe; Wilson, Glenn F.

doi:10.1016/0301-0511(94)90039-6

Cited by 52 publications

(32 citation statements)

References 30 publications

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“…The difference in difficulty for name-identity and physical-identity judgments is evident not only in performance measures, but also in psychophysiological measures of brain activity. Palmer, Nasman, and Wilson (1994) found that the P3 component of the event-related potential was of smaller amplitude for name-identity judgments than for physical-identity judgments, consistent with the former task requiring additional processing.…”

supporting

confidence: 50%

Influence of category identity on letter matching: Conceptual penetration of visual processing or response competition?

Chen

Proctor

2012

Atten Percept Psychophys

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Participants performed same-different matching tasks, with physical-identity instructions, on letter pairs composed from the letters B, b, and p. The letters in a pair were presented simultaneously or sequentially, with the experiments differing in whether (1) the letters could appear in two or four positions, (2) two or five SOAs were used, (3) the font was Arial or one in which the two loops of the letter B were of the same size, and (4) p did or did not occur in same pairs. With sequential presentation, different RTs were longer when the letters had the same name (Bb; withincategory pair) than when they did not (Bp; betweencategory pair), replicating a finding by Lupyan et al. (2010). However, unlike in their study, this category effect was also significant with simultaneous presentation, tending to be nonsignificantly smaller for RTs but larger for accuracy than that obtained with sequential presentation. A similar pattern was observed when we removed a bias to respond different whenever the letter p was detected in the experiments in which p did not appear in same pairs. The presence of a category effect with simultaneous presentation is predicted by a response competition account, but not by Lupyan et al.'s conceptual-penetration-of-visual-processing account.

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confidence: 50%

Influence of category identity on letter matching: Conceptual penetration of visual processing or response competition?

Chen

Proctor

2012

Atten Percept Psychophys

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“…It has been suggested that P300 is a valid index of central information processing (Palmer, Nasman, & Wilson, 1994), and can be seen as an indicator of dynamic updating of information held in working memory (Fitzgerald & Picton, 1983), mental effort (Wilson et al, 1998) or as reflecting higher-order cognitive processes such as stimulus evaluation and categorization (Polich, 1987;Polich & Heine,1996).…”

Section: Introductionmentioning

confidence: 99%

“…Various researchers have suggested that P300s reflect central activation of information processing (e.g., Palmer et al, 1994). It has also been suggested that P300 reflects updating in working memory (e.g., Donchin & Israel, 1980;Wolach & Pratt, 2001), cognitive resource allocation (Kramer, Strayer & Buckley, 1991;Polich, 1987;Polich & Heine, 1996), and mental effort (e.g., Wilson et al, 1998).…”

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confidence: 97%

Brain activity of regular and dyslexic readers while reading Hebrew as compared to English sentences

2004

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The aim of the present study was to examine differences among 'regular' and dyslexic adult bilingual readers when processing reading and reading related skills in their first (L1 Hebrew) and second (L2 English) languages. Brain activity during reading Hebrew and English unexpected sentence endings was also studied. Behavioral and electrophysiological measures including event-related potentials (ERP) and low resolution electromagnetic tomography (LORETA) methodology were employed. Results indicated discrepancies in the processing profiles of dyslexic and regular bilingual readers in both first and second languages. In general, the amplitudes of the evoked potentials were higher and the latencies longer among dyslexic readers during processing of information in first and second languages (L1 and L2), but were more pronounced in English (L2). LORETA analysis indicated evidence that the source of brain activity measured by current density of brain activation is different when reading Hebrew as compared to English sentences mainly among dyslexics and not among regular readers. The data from the present study supports the 'dominanat bilingual' hypothesis for defining bilinguals. A discrepancy between achievement in performing various L1 and L2 tasks was consistent across groups. Both groups were better in there mother tongue, which was Hebrew as compared to English.

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“…Another ERP component which has been associated with discrimination tasks is the P3 (Mecklinger et al, 1998). Most studies which investigated the visual or auditory evoked P3 found a delay of latency and a decrease of amplitude for more difficult discrimination processes, especially when comparing target stimuli with non-target stimuli (Polich, 1987;Palmer et al, 1994;Hoffman et al, 1985). The P3 latency and amplitude effects were found at frontal and posterior electrode sites (Comerchero and Polich, 1999).…”

Section: Introductionmentioning

confidence: 99%

Effects of task difficulty on evoked gamma activity and ERPs in a visual discrimination task

Senkowski

Herrmann

2002

Clinical Neurophysiology

138

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Objective: The present study examined oscillatory brain activity of the EEG gamma band and event-related potentials (ERPs) with relation to the difficulty of a visual discrimination task.Methods: Three tasks with identical stimulus material were performed by 9 healthy subjects. The tasks comprised a passive control task, and an easy and a hard visual discrimination task, requiring discrimination of the color of circles. EEG was recorded from 26 electrodes. A wavelet transform based on Morlet wavelets was employed for the analysis of gamma activity.Results: Evoked EEG gamma activity was enhanced by both discrimination tasks as compared to the passive control task. Within the two discrimination tasks, the latency of the evoked gamma peak was delayed for the harder task. Higher amplitudes of the ERP components N170 and P300 were found in both discrimination tasks as compared to the passive task. The N2b, which showed a maximum activation at about 260 ms, was increased in the hard discrimination task as compared to the easy discrimination task.Conclusions: Our results indicate that early evoked gamma activity and N2b are related to the difficulty of visual discrimination processes. A delayed gamma activity in the hard task indicated a longer duration of stimulus processing, whereas the amplitude of the N2b directly indicates the level of task difficulty. q

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Task decision difficulty: effects on ERPs in a same-different letter classification task

Cited by 52 publications

References 30 publications

Influence of category identity on letter matching: Conceptual penetration of visual processing or response competition?

Influence of category identity on letter matching: Conceptual penetration of visual processing or response competition?

Brain activity of regular and dyslexic readers while reading Hebrew as compared to English sentences

Effects of task difficulty on evoked gamma activity and ERPs in a visual discrimination task

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